CN2913682Y - Four-leaf Roots blower - Google Patents

Abstract

The utility model discloses a four-blade roots blower which comprises a housing provided inside with a master shaft and an auxiliary shaft, a driving impeller and a driven impeller arranged respectively on the master and auxiliary shafts and engaged with each other, synchronous gears arranged on the master and auxiliary shafts and adapted to rotate in opposite direction, a driving shaft arranged on the housing by using a bearing, a bearing support and a seal, an air inlet arranged on the driving impeller and, and an air outlet arranged on the housing. The utility model is characterized in that each of the driving impeller and driven impeller is of four-blade type, the engagement line of the two impellers is arc-shaped, and the arc line at the engagement site is an interactive composite envelope curve. The utility model has the advantages of stable operation and high work efficiency.

Description

Four leaf Roots blowers

Technical field

The utility model relates to blower parts, a kind of four leaf Roots blowers of more specifically saying so.

Background technique

Existing Roots blower mainly adopts trilobed wheel, just like application number is 01272827, the applying date is December 14 calendar year 2001, denomination of invention is the patent application of Roots blower, comprise left wallboard and the right wallboard that is fixed on the left and right two ends of casing, the gear-box that is fixed on the left wallboard outside etc., pass engagement and counterrotating with a gap under the drive of the synchromesh gear of master and slave moving axis in gear-box of chassis cavity, initiatively impeller and driven impeller are separately fixed on the master and slave moving axis; Initiatively impeller and driven impeller are trilobal cross.This patent adopts trilobed wheel exactly, and its using effect is better, but it still remains at aspects such as flow, volumetric efficiency, running stability, volume specific energys to be improved.

Summary of the invention

The purpose of this utility model is exactly in order to solve the deficiency of prior art, and provide a kind ofly have the four leaf Roots blowers that flow is big, volumetric efficiency is higher, operation is more steady, the volume specific energy is lower under the same conditions.

The utility model is to adopt following technical solution to realize above-mentioned purpose: this four leaves Roots blower by the synchromesh gear of the counterrotating of being equipped with respectively on the intermeshing active impeller that is equipped with on the major and minor axle in the housing, driven impeller, the major-minor axle, be contained in the driving shaft on the housing, the intake grill of Blower Housing, the exhaust outlet of Blower Housing by bearing, bearing support and Sealing and constitute, it is characterized in that, described active impeller and driven impeller are four blade profiles, the two engagement line style is a circular arc line, is mutual superpacket winding thread at the engagement place circular arc line.

One group of circular arc that this engagement place circular arc line is made of cycloid or involute trend.

Described mutual superpacket winding thread gap control is in 0.002～0.005mm.

Described inlets and putlets of ventilation is oppositely arranged on the both sides of housing.

Described inlets and putlets of ventilation is sped structure.

The beneficial effect that the utility model adopts above-mentioned technical solution to reach is:

One, volumetric efficiency height; The area utilization factor of four leaf impellers is big, and three leaves are about 0.53, four leaf and are about 0.57, and under the condition of identical impeller size and pressure reduction, the flow increase is about 8%, and volumetric efficiency also has corresponding raising.

Two, under the same terms, four leaf impeller moments the maximum of being born make a concerted effort littler, i.e. Fa, max, 4/Fa, max, $3=\sqrt{2}/\sqrt{3}$ , the therefore volume specific energy of four leaves lower than three leaves.

Three, with under the condition, the pulse phenomenon that four leaf impeller exhausts produce weakens, and vibration and noise are also lower, and four leaf impellers of the utility model Roots blower adopt special compound linearly in addition, and the impeller clearance is even, has reduced internal leakage, moves more steady.

Four, these four leaf Roots blowers are applicable to malleation or negative pressure.

Description of drawings

Fig. 1 is the sectional structure schematic representation of three leaf Roots blowers;

Fig. 2 is a sectional structure schematic representation of the present utility model.

Embodiment

As shown in Figure 2, this four leaves Roots blower is by the master in the housing 1, the intermeshing principal and subordinate's movable vane wheel (11 that is equipped with on the countershaft, 12), the synchromesh gear of the counterrotating of being equipped with respectively on the major-minor axle, pass through bearing, bearing support and Sealing are contained in the driving shaft on the housing, the intake grill 2 on Blower Housing top, the exhaust outlet 3 of Fan casing bottom constitutes, inlets and putlets of ventilation (2,3) be sped structure, initiatively impeller 11 and driven impeller 12 are four blade profiles, the two engagement line style is a circular arc line, one group of circular arc that this circular arc line is made of cycloid or involute trend, at the engagement place circular arc line is mutual superpacket winding thread, and mutual superpacket winding thread gap is 0.003mm.

This intake grill also can be arranged on lower part of frame, and exhaust outlet is arranged on the top of housing.

This inlets and putlets of ventilation also can be arranged on the both sides of housing.

During use, blower fan makes active impeller, driven impeller relatively be opposite spin by the effect of engine housing inter-sync gear, and the suitable working clearance is all arranged between the impeller and between impeller and the body.Because adopt spiral air inlet/outlet, impeller is spaced from each other inlets and putlets of ventilation in rotary course, the gas in the air cavity is pushed to exhaust outlet by air-inlet cavity in there is no with pressing, reach the effect of air blast.

As shown in Figure 1, contrast existing three leaf Roots blowers, obviously as can be known, four leaf impeller clearances are even, reduced internal leakage, move more steadily, and working efficiency is higher.

Claims (5)

1, a kind of four leaf Roots blowers, by the synchromesh gear of the counterrotating of being equipped with respectively on the intermeshing principal and subordinate's movable vane wheel that is equipped with on the major and minor axle in the housing, the major-minor axle, be contained in the driving shaft on the housing, the intake grill of Blower Housing, the exhaust outlet of Blower Housing by bearing, bearing support and Sealing and constitute, it is characterized in that, described active impeller and driven impeller are four blade profiles, the two engagement line style is a circular arc line, is mutual superpacket winding thread at the engagement place circular arc line.

2, four leaf Roots blowers according to claim 1 is characterized in that, one group of circular arc that described engagement place circular arc line is made of cycloid or involute trend.

3, four leaf Roots blowers according to claim 1 is characterized in that, described mutual superpacket winding thread gap is 0.002～0.005mm.

4, four leaf Roots blowers according to claim 1 is characterized in that described inlets and putlets of ventilation is sped structure.

5, according to claim 1 or 4 described four leaf Roots blowers, it is characterized in that described inlets and putlets of ventilation is arranged on the both sides of Blower Housing.